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<title>Skipping Over Functions and Files - Debugging with GDB</title>
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<a name="Skipping-Over-Functions-and-Files"></a>
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Next: <a rel="next" accesskey="n" href="Signals.html#Signals">Signals</a>,
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Previous: <a rel="previous" accesskey="p" href="Continuing-and-Stepping.html#Continuing-and-Stepping">Continuing and Stepping</a>,
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<h3 class="section">5.3 Skipping Over Functions and Files</h3>
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<p><a name="index-skipping-over-functions-and-files-376"></a>
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The program you are debugging may contain some functions which are
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uninteresting to debug. The <code>skip</code> command lets you tell <span class="sc">gdb</span> to
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skip a function, all functions in a file or a particular function in
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a particular file when stepping.
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<p>For example, consider the following C function:
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<pre class="smallexample"> 101 int func()
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102 {
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103 foo(boring());
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104 bar(boring());
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105 }
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</pre>
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<p class="noindent">Suppose you wish to step into the functions <code>foo</code> and <code>bar</code>, but you
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are not interested in stepping through <code>boring</code>. If you run <code>step</code>
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at line 103, you'll enter <code>boring()</code>, but if you run <code>next</code>, you'll
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step over both <code>foo</code> and <code>boring</code>!
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<p>One solution is to <code>step</code> into <code>boring</code> and use the <code>finish</code>
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command to immediately exit it. But this can become tedious if <code>boring</code>
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is called from many places.
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<p>A more flexible solution is to execute <kbd>skip boring</kbd>. This instructs
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<span class="sc">gdb</span> never to step into <code>boring</code>. Now when you execute
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<code>step</code> at line 103, you'll step over <code>boring</code> and directly into
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<code>foo</code>.
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<p>Functions may be skipped by providing either a function name, linespec
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(see <a href="Specify-Location.html#Specify-Location">Specify Location</a>), regular expression that matches the function's
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name, file name or a <code>glob</code>-style pattern that matches the file name.
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<p>On Posix systems the form of the regular expression is
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“Extended Regular Expressions”. See for example ‘<samp><span class="samp">man 7 regex</span></samp>’
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on <span class="sc">gnu</span>/Linux systems. On non-Posix systems the form of the regular
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expression is whatever is provided by the <code>regcomp</code> function of
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the underlying system.
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See for example ‘<samp><span class="samp">man 7 glob</span></samp>’ on <span class="sc">gnu</span>/Linux systems for a
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description of <code>glob</code>-style patterns.
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<a name="index-skip-377"></a>
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<dl><dt><code>skip </code><span class="roman">[</span><var>options</var><span class="roman">]</span><dd>The basic form of the <code>skip</code> command takes zero or more options
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that specify what to skip.
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The <var>options</var> argument is any useful combination of the following:
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<dl>
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<dt><code>-file </code><var>file</var><dt><code>-fi </code><var>file</var><dd>Functions in <var>file</var> will be skipped over when stepping.
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<br><dt><code>-gfile </code><var>file-glob-pattern</var><dt><code>-gfi </code><var>file-glob-pattern</var><dd><a name="index-skipping-over-files-via-glob_002dstyle-patterns-378"></a>Functions in files matching <var>file-glob-pattern</var> will be skipped
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over when stepping.
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<pre class="smallexample"> (gdb) skip -gfi utils/*.c
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</pre>
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<br><dt><code>-function </code><var>linespec</var><dt><code>-fu </code><var>linespec</var><dd>Functions named by <var>linespec</var> or the function containing the line
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named by <var>linespec</var> will be skipped over when stepping.
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See <a href="Specify-Location.html#Specify-Location">Specify Location</a>.
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<br><dt><code>-rfunction </code><var>regexp</var><dt><code>-rfu </code><var>regexp</var><dd><a name="index-skipping-over-functions-via-regular-expressions-379"></a>Functions whose name matches <var>regexp</var> will be skipped over when stepping.
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<p>This form is useful for complex function names.
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For example, there is generally no need to step into C<tt>++</tt> <code>std::string</code>
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constructors or destructors. Plus with C<tt>++</tt> templates it can be hard to
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write out the full name of the function, and often it doesn't matter what
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the template arguments are. Specifying the function to be skipped as a
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regular expression makes this easier.
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<pre class="smallexample"> (gdb) skip -rfu ^std::(allocator|basic_string)<.*>::~?\1 *\(
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</pre>
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<p>If you want to skip every templated C<tt>++</tt> constructor and destructor
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in the <code>std</code> namespace you can do:
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<pre class="smallexample"> (gdb) skip -rfu ^std::([a-zA-z0-9_]+)<.*>::~?\1 *\(
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</pre>
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</dl>
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<p>If no options are specified, the function you're currently debugging
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will be skipped.
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<p><a name="index-skip-function-380"></a><br><dt><code>skip function </code><span class="roman">[</span><var>linespec</var><span class="roman">]</span><dd>After running this command, the function named by <var>linespec</var> or the
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function containing the line named by <var>linespec</var> will be skipped over when
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stepping. See <a href="Specify-Location.html#Specify-Location">Specify Location</a>.
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<p>If you do not specify <var>linespec</var>, the function you're currently debugging
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will be skipped.
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<p>(If you have a function called <code>file</code> that you want to skip, use
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<kbd>skip function file</kbd>.)
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<p><a name="index-skip-file-381"></a><br><dt><code>skip file </code><span class="roman">[</span><var>filename</var><span class="roman">]</span><dd>After running this command, any function whose source lives in <var>filename</var>
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will be skipped over when stepping.
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<pre class="smallexample"> (gdb) skip file boring.c
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File boring.c will be skipped when stepping.
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</pre>
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<p>If you do not specify <var>filename</var>, functions whose source lives in the file
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you're currently debugging will be skipped.
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</dl>
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<p>Skips can be listed, deleted, disabled, and enabled, much like breakpoints.
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These are the commands for managing your list of skips:
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<a name="index-info-skip-382"></a>
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<dl><dt><code>info skip </code><span class="roman">[</span><var>range</var><span class="roman">]</span><dd>Print details about the specified skip(s). If <var>range</var> is not specified,
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print a table with details about all functions and files marked for skipping.
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<code>info skip</code> prints the following information about each skip:
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<dl>
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<dt><em>Identifier</em><dd>A number identifying this skip.
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<br><dt><em>Enabled or Disabled</em><dd>Enabled skips are marked with ‘<samp><span class="samp">y</span></samp>’.
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Disabled skips are marked with ‘<samp><span class="samp">n</span></samp>’.
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<br><dt><em>Glob</em><dd>If the file name is a ‘<samp><span class="samp">glob</span></samp>’ pattern this is ‘<samp><span class="samp">y</span></samp>’.
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Otherwise it is ‘<samp><span class="samp">n</span></samp>’.
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<br><dt><em>File</em><dd>The name or ‘<samp><span class="samp">glob</span></samp>’ pattern of the file to be skipped.
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If no file is specified this is ‘<samp><span class="samp"><none></span></samp>’.
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<br><dt><em>RE</em><dd>If the function name is a ‘<samp><span class="samp">regular expression</span></samp>’ this is ‘<samp><span class="samp">y</span></samp>’.
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Otherwise it is ‘<samp><span class="samp">n</span></samp>’.
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<br><dt><em>Function</em><dd>The name or regular expression of the function to skip.
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If no function is specified this is ‘<samp><span class="samp"><none></span></samp>’.
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</dl>
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<p><a name="index-skip-delete-383"></a><br><dt><code>skip delete </code><span class="roman">[</span><var>range</var><span class="roman">]</span><dd>Delete the specified skip(s). If <var>range</var> is not specified, delete all
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skips.
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<p><a name="index-skip-enable-384"></a><br><dt><code>skip enable </code><span class="roman">[</span><var>range</var><span class="roman">]</span><dd>Enable the specified skip(s). If <var>range</var> is not specified, enable all
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skips.
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<p><a name="index-skip-disable-385"></a><br><dt><code>skip disable </code><span class="roman">[</span><var>range</var><span class="roman">]</span><dd>Disable the specified skip(s). If <var>range</var> is not specified, disable all
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skips.
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<p><a name="index-set-debug-skip-386"></a><br><dt><code>set debug skip </code><span class="roman">[</span><code>on|off</code><span class="roman">]</span><dd>Set whether to print the debug output about skipping files and functions.
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<p><a name="index-show-debug-skip-387"></a><br><dt><code>show debug skip</code><dd>Show whether the debug output about skipping files and functions is printed.
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</dl>
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